I think Dieter was referring to a setting you can adjust in some Linux
distributions. You can either let the hardware clock run as UTC or local
time. This can avoid messing up the time setting of another OS which
might be started alternatively from another partition and assumes the
hardware clock runs in the local timezone.

That would only affect you if you reboot or otherwise switch OSes on the
machine. At shutdown, the system clock would get written to the
hardware clock, so that information could be used on restart.
Otherwise, you might have a long re-sync time on boot.

But the whole hardware clock/system clock thing isn't going to do you
any good outside of the context of rebooting or switching OSes.